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1# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2# Most of this file is copied from tools/lib/traceevent/Makefile
3
4RM ?= rm
5srctree = $(abs_srctree)
6
7VERSION_SCRIPT := libbpf.map
8LIBBPF_VERSION := $(shell \
9 grep -oE '^LIBBPF_([0-9.]+)' $(VERSION_SCRIPT) | \
10 sort -rV | head -n1 | cut -d'_' -f2)
11LIBBPF_MAJOR_VERSION := $(firstword $(subst ., ,$(LIBBPF_VERSION)))
12
13MAKEFLAGS += --no-print-directory
14
15# This will work when bpf is built in tools env. where srctree
16# isn't set and when invoked from selftests build, where srctree
17# is a ".". building_out_of_srctree is undefined for in srctree
18# builds
19ifndef building_out_of_srctree
20srctree := $(patsubst %/,%,$(dir $(CURDIR)))
21srctree := $(patsubst %/,%,$(dir $(srctree)))
22srctree := $(patsubst %/,%,$(dir $(srctree)))
23#$(info Determined 'srctree' to be $(srctree))
24endif
25
26INSTALL = install
27
28# Use DESTDIR for installing into a different root directory.
29# This is useful for building a package. The program will be
30# installed in this directory as if it was the root directory.
31# Then the build tool can move it later.
32DESTDIR ?=
33DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
34
35include $(srctree)/tools/scripts/Makefile.arch
36
37ifeq ($(LP64), 1)
38 libdir_relative = lib64
39else
40 libdir_relative = lib
41endif
42
43prefix ?= /usr/local
44libdir = $(prefix)/$(libdir_relative)
45man_dir = $(prefix)/share/man
46man_dir_SQ = '$(subst ','\'',$(man_dir))'
47
48export man_dir man_dir_SQ INSTALL
49export DESTDIR DESTDIR_SQ
50
51include $(srctree)/tools/scripts/Makefile.include
52
53# copy a bit from Linux kbuild
54
55ifeq ("$(origin V)", "command line")
56 VERBOSE = $(V)
57endif
58ifndef VERBOSE
59 VERBOSE = 0
60endif
61
62INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/include/uapi
63
64export prefix libdir src obj
65
66# Shell quotes
67libdir_SQ = $(subst ','\'',$(libdir))
68libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
69
70OBJ = $@
71N =
72
73LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION)
74LIB_FILE = libbpf.a libbpf.so*
75PC_FILE = libbpf.pc
76
77# Set compile option CFLAGS
78ifdef EXTRA_CFLAGS
79 CFLAGS := $(EXTRA_CFLAGS)
80else
81 CFLAGS := -g -O2
82endif
83
84# Append required CFLAGS
85override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum
86override CFLAGS += -Werror -Wall
87override CFLAGS += $(INCLUDES)
88override CFLAGS += -fvisibility=hidden
89override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
90
91# flags specific for shared library
92SHLIB_FLAGS := -DSHARED -fPIC
93
94ifeq ($(VERBOSE),1)
95 Q =
96else
97 Q = @
98endif
99
100# Disable command line variables (CFLAGS) override from top
101# level Makefile (perf), otherwise build Makefile will get
102# the same command line setup.
103MAKEOVERRIDES=
104
105all:
106
107export srctree OUTPUT CC LD CFLAGS V
108include $(srctree)/tools/build/Makefile.include
109
110SHARED_OBJDIR := $(OUTPUT)sharedobjs/
111STATIC_OBJDIR := $(OUTPUT)staticobjs/
112BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o
113BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o
114BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h
115
116LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))
117LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
118PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE))
119
120TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags)
121
122GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \
123 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
124 sed 's/\[.*\]//' | \
125 awk '/GLOBAL/ && /DEFAULT && !/UND/ {print $$NF}' | \
126 sort -u | wc -l)
127VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
128 sed 's/\[.*\]//' | \
129 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}' | \
130 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
131
132CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)
133
134all: fixdep
135 $(Q)$(MAKE) all_cmd
136
137all_cmd: $(CMD_TARGETS) check
138
139$(BPF_IN_SHARED): force $(BPF_HELPER_DEFS)
140 @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
141 (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
142 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
143 @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
144 (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
145 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf_common.h' differs from latest version at 'include/uapi/linux/bpf_common.h'" >&2 )) || true
146 @(test -f ../../include/uapi/linux/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \
147 (diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \
148 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true
149 @(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \
150 (diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \
151 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_link.h' differs from latest version at 'include/uapi/linux/if_link.h'" >&2 )) || true
152 @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
153 (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
154 echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_xdp.h' differs from latest version at 'include/uapi/linux/if_xdp.h'" >&2 )) || true
155 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"
156
157$(BPF_IN_STATIC): force $(BPF_HELPER_DEFS)
158 $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
159
160$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h
161 $(QUIET_GEN)$(srctree)/scripts/bpf_doc.py --header \
162 --file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS)
163
164$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
165
166$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT)
167 $(QUIET_LINK)$(CC) $(LDFLAGS) \
168 --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
169 -Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@
170 @ln -sf $(@F) $(OUTPUT)libbpf.so
171 @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)
172
173$(OUTPUT)libbpf.a: $(BPF_IN_STATIC)
174 $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^
175
176$(OUTPUT)libbpf.pc:
177 $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
178 -e "s|@LIBDIR@|$(libdir_SQ)|" \
179 -e "s|@VERSION@|$(LIBBPF_VERSION)|" \
180 < libbpf.pc.template > $@
181
182check: check_abi
183
184check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT)
185 @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \
186 echo "Warning: Num of global symbols in $(BPF_IN_SHARED)" \
187 "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \
188 "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
189 "Please make sure all LIBBPF_API symbols are" \
190 "versioned in $(VERSION_SCRIPT)." >&2; \
191 readelf -s --wide $(BPF_IN_SHARED) | \
192 cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
193 sed 's/\[.*\]//' | \
194 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \
195 sort -u > $(OUTPUT)libbpf_global_syms.tmp; \
196 readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
197 sed 's/\[.*\]//' | \
198 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \
199 grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \
200 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \
201 diff -u $(OUTPUT)libbpf_global_syms.tmp \
202 $(OUTPUT)libbpf_versioned_syms.tmp; \
203 rm $(OUTPUT)libbpf_global_syms.tmp \
204 $(OUTPUT)libbpf_versioned_syms.tmp; \
205 exit 1; \
206 fi
207
208define do_install_mkdir
209 if [ ! -d '$(DESTDIR_SQ)$1' ]; then \
210 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
211 fi
212endef
213
214define do_install
215 if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
216 $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
217 fi; \
218 $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'
219endef
220
221install_lib: all_cmd
222 $(call QUIET_INSTALL, $(LIB_TARGET)) \
223 $(call do_install_mkdir,$(libdir_SQ)); \
224 cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
225
226INSTALL_HEADERS = bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h xsk.h \
227 bpf_helpers.h $(BPF_HELPER_DEFS) bpf_tracing.h \
228 bpf_endian.h bpf_core_read.h skel_internal.h
229
230install_headers: $(BPF_HELPER_DEFS)
231 $(call QUIET_INSTALL, headers) \
232 $(foreach hdr,$(INSTALL_HEADERS), \
233 $(call do_install,$(hdr),$(prefix)/include/bpf,644);)
234
235install_pkgconfig: $(PC_FILE)
236 $(call QUIET_INSTALL, $(PC_FILE)) \
237 $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)
238
239install: install_lib install_pkgconfig install_headers
240
241clean:
242 $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \
243 *~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_HELPER_DEFS) \
244 $(SHARED_OBJDIR) $(STATIC_OBJDIR) \
245 $(addprefix $(OUTPUT), \
246 *.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc)
247
248PHONY += force cscope tags
249force:
250
251cscope:
252 ls *.c *.h > cscope.files
253 cscope -b -q -I $(srctree)/include -f cscope.out
254
255tags:
256 $(RM) -f TAGS tags
257 ls *.c *.h | xargs $(TAGS_PROG) -a
258
259# Declare the contents of the .PHONY variable as phony. We keep that
260# information in a variable so we can use it in if_changed and friends.
261.PHONY: $(PHONY)
262
263# Delete partially updated (corrupted) files on error
264.DELETE_ON_ERROR: